APA-referens (7:e uppl.)

Catholic Church. Pope (1939-1958 : Pius XII). (1939). Summi pontificatus: Encyclical letter exhorting unity in opposing world evils. Paulist Press.

Chicago-referens (17:e uppl.)

Catholic Church. Pope (1939-1958 : Pius XII). Summi Pontificatus: Encyclical Letter Exhorting Unity in Opposing World Evils. [New York: Paulist Press, 1939.

MLA-referens (8:e uppl.)

Catholic Church. Pope (1939-1958 : Pius XII). Summi Pontificatus: Encyclical Letter Exhorting Unity in Opposing World Evils. Paulist Press, 1939.